Let's assume humans could just fly, no wings. Regarding infrastructure in cities (large and small), what would be different.
A couple of thoughts I had.
- Roads would only be used for transporting goods. So there would be way less roads, and those that exist are purely for logistics.
- Home security would be a nightmare. Anyone can land on your property, so we'd need some kind of non-lethal anti air home security.
- Tall would be more common since we can just fly to the right level.
What other things be drastically different from today?